Pages

13/04/2019

Standard Alternating Voltage And Permissible Voltage Limit

The standard voltage
( in India ) for low and medium line distribution was 230 V for single phase
and 230 / 400 V for three phase system but due to economic advantage IEC recommended
240 V for single phase and 240 / 415 V for three phase system voltage with ± 6%
voltage variation.

The IEC decided ± 10% voltage variation allowed for 240 V
for single phase and 240 / 415 V for three phase system voltage in the year
2009.

The 110 kV is not standard transmission voltage but it is included due to
sake of equipment which are already used for 110 kV.

The standard DC
distribution voltage is 220 / 440 V.

Standard
Alternating voltage Line to Line

240 V ( Line to
Neutral )

415 V

3.3 kV

11 kV

22 kV

33 kV

66 kV

110 kV

132 kV

220 kV

400 kV

Voltage Variations Limits

10% for low
voltage

6% for higher
side and 9% on lower side in the high voltage transmission

12.5% for extra
high voltage transmission

The system voltage with lowest voltage and highest voltage is summarized as below.

System voltage

Lowest voltage

Highest voltage

240 V

216 V

264 V

415 V

374 V

457 V

3.3 kV

3.0 kV

3.6 kV

6.6 kV

6.0 kV

7.2 kV

11 kV

10 kV

12 kV

22 kV

20 kV

24 kV

33 kV

30 kV

36 kV

66 kV

60 kV

72.5 kV

132 kV

120 kV

145 kV

220 kV

200 kV

245 kV

440 kV

380 kV

420 kV

These voltage
variations have no concerned with permissible voltage variations.